Mine-pulley.



Patented Mar 6 1917..

M w m m m m JAMES BOYD ANDERSON, OF SHICKSI-IINNY, PENNSYLVANIA.

MIN E-PULLEY.

Specification of Letters Patent.

Patented Mar. 6, 1917.

Application filed June 2, 1916. Serial no. 101,429.

To all wkomz't-may concern:

Be it known that I, JAMES BOYD ANDER- soN, a citizen of the United States, residing at Shickshinny, in the county ofLuzernc and State of Pennsylvania, have invented certain new and useful Improvements in Mine-Pulleys, of which the following is a specification.

My invention relates to improvements in pulleys or rollers which may be used for various purposes but are especially adapted for use in supporting the hauling cables attached to mine cars to prevent the cable from chafing or cutting into the tics and also to reduce the drag friction.

Mine pulleys are constructed of hard wood and are provided with a normal iron bearing pin or spindle which is driven through a hole bored through the axis. Owing to the difliculty of boring an axial hole from one end to the other, it is common practice to bore from each end toward 'the center.

As the boring tool has a tendency to follow the grain of the wood, the holes are usually out of alinement with each other and are not parallel with the axis of the roller. Owing to this fact it is with difliculty that the pins are driven through and large numbers are split in attempting to force the pins through the crooked holes. Furthermore these inaccuracies cause the rollers to wabble badly which results in destructive wear upon the bearings.

For the purpose of overcoming the defects above noted, applicant has devised a pulley or roller having separate bearing pins upon either end and which are secured in comparatively shallow holes or sockets which may therefore be accurately bored on the line of the central axis. I have also devised a method of securing the bearing pins so that they may sustain the strains to whichthey are subjected without endangering the integrity of the pins or loosening them in their sockets.

In the accompanying drawings, Figure 1 is a side elevation illustrating the manner of using mine pulleys; Fig. 2 is a top-plan view of a mine pulley or-roller embodying my invention; Figs. 3 and 4 are longitudinal sectional views respectively of one end of a pulley having a socket bored therein and showing the manner of inserting the form of bearing pin or gudgeon illustrated in Fig. 7 and Figs. 5 and6 are longitudinal sectional views of one end of a pulley showing respectively another form of socket and the manner of inserting a bearing pin or gudgeon of the form illustrated in Fig. 8.

Pulleys such as are employed in the tracks used for hauling mine cars are subjected to very hard usage and to great strains which tend to loosen the bearing pins. It is necessary, therefore, to provide means for securely fastening the pins within the body of the pulley or roller. previously stated, I here a comparatively short or shallow hole or socket 2, in each end, which can be accurately located on the central. axis, thereby insuring steady even rotation of the bot y of the rolleror pulley. This feature alone eliminates a large proportion of the wear heretofore found in mine pulleys.

When I employ a bearing pin of the form shown in Fig. 7, I bore a comparatively shallow hole 2, of uniform bore into each end of the roller block 3, which is just suflicient in diameter to permit the insertion of the gudgeon pin 4. When the end of the pin bears against the inner end of the hole or recess 2, as indicated in solid lines inFig. 4-,

it is then driven by hard blows untilthe'inner split end has cut its way into the solid body of the roller as shownby dotted lines in Fig. 2. For the purpose of causing the inner end of the pin to spread outwardly in the manner indicated, I cut a number of slots 5 in the end and bevel the edge from theinside surface to the periphery as indicated at e As the tube or pin is driven into the body of the roller, the greater resistance of the wood being cut is exerted against the inner beveled edges 4- exerting a great pressure outwardly and causing the metal to spread until it is securely anchored in the manner shown.

I may employ another form of gudgeon pin, shown in Fig. 8, themethod of securing it inthe roller being illustrated in Figs. 5 and 6.

One end of the pin 4' is threaded as indicated at 4 In'preparing the holes or recesses in. the opposite ends ofthe roller block 3, I first bore a shallow portion 2*, as in the method previously described, of a diameter to permit the pin or tube to be inserted with a snug fit. I then bore from the bottom of the hole 2*, a hole 2*, slightly less in diameter, amounting usually to a difference of one-eighth of an inch, the difference being less than twice the depth of clamped in a suitable tool and rotated, .caus-' ing the threads. to cut a corresponding spiral in the walls of the recess until the end of the pin has reached the bottomor inner end of the portion 2 The threads have thus embedded themselves in the solid wood and formed an anchorage which is capable of resisting an outward pull of several thousand pounds. I have shown the pin in the form of a tube but in this threaded form I may employ a solid pin if desired.

In each form of my invention the/inner end of the gudgeon pin is firmly anchored with very great rigidity so that it is able to withstand all of the hard usage to which mine rollers are subjected without becoming loose. I make the recess or hole of such depth that the anchoring part of the pin shall be inserted a sufiicient distance to provide a portion of the uncut or unthreaded pin within the recess portion 2 orQ, which as previously explained, fits snugly about the periphery of the pin and forms a bearing therefor to brace the pin against lateral or bending strains which are greatest at this point. r

' Mine pulleys are. usually supported in the manner indicated in Figs. 1 and 2. The pins 4: are mounted in bearings in brackets 6, which may conveniently be secured to the ties 7 upon which the rails 8 are spiked. As indicated in Fig. 1, the cable 10, by which the car 12 is hauled, passes over these rollers, which not only prevent the cable Copies of this patent may be obtained for within the scope of my claims and without 7 in any manner departing from the spirit of my invention.

I claim 1-- 1. A pulley or roller comprising a wooden body portion provided with recesses in opposite ends and gudgeons extending into said recesses, said gudge'ons having main body portions of uniform diameter throughout which fit snugly within the recesses to brace the gudgeons against lateral pressures or strains, and anchoring portions which are embedded in the fibers of the wood.

2. A pulley or roller comprising a wooden body portion provided with recesses in opposite ends, and gudgeons extending into said recesses, said recesses having portions of different diameters, the outer portion having the larger diameter, said gudgeons having main body portions of uniform diameter throughout which fit snugly within the outer recess portions to brace the gudgeons against lateral pressures or strains, and anchoring portions which extend into the inner smaller recess portions and are embedded in the fibers of the wood.

In testimony whereofI alliX my signature in presence of two witnesses.

. JAMES BOYD ANDERSON. lVitnesses:

D. J. Manson,

E. W. GAnnIsoN.

five cents each, by addressing the Commissioner of Patents,

Washington, .D. G. 

